<template xlang="wxml" minapp="mpvue">
	<view class="tki-tree" @touchmove.stop="">
		<view class="tki-tree-mask" :class="{'show':showTree}" @tap="_cancel"></view>
		<view class="tki-tree-cnt" :class="{'show':showTree}">
			<view class="tki-tree-bar">
				<view class="tki-tree-bar-cancel" :style="{'color':cancelColor}" hover-class="hover-c" @tap="_cancel">取消</view>
				<view class="tki-tree-bar-title" :style="{'color':titleColor}">{{title}}</view>
				<view class="tki-tree-bar-confirm" :style="{'color':confirmColor}" hover-class="hover-c" @tap="_confirm">确定</view>
			</view>
			<!-- <view class="tki-tree-input" v-if="intIsShow" >
				<view style="border: 1px solid lightgray; border-radius: 10rpx; height: 60rpx; padding: 0 20rpx;">
					<form-text-input clear @input="search" v-model="searchVal" :placeholder="placeholder"/>
				</view>
			</view> -->
			<!-- <view class="tki-tree-view">
				
			</view> -->
			<scroll-view class="tki-tree-view-sc" :scroll-y="true" style="padding-bottom: 50px;">
				<block v-for="(item, index) in treeList" :key="index">
					<view class="tki-tree-item" 
						:style="[{
							paddingLeft: item.rank*15 + 10 + 'px',
							zIndex: item.rank*-1 +50
						}]" 
						:class="{
							border: border === true,
							show: item.show,
							last: item.lastRank,
							showchild: item.showChild
						}"
					>
						<view class="tki-tree-label" @tap.stop="_treeItemTap(item, index)" :class="{ 'tki-tree-selected': item.checked }">
							<image class="tki-tree-icon" :src="item.lastRank ? lastIcon : item.showChild ? currentIcon : defaultIcon"></image>
							{{item.name}}
						</view>
						<view class="tki-tree-check" @tap.stop="_treeItemSelect(item, index)" v-if="selectParent?true:item.lastRank">
							<view class="tki-tree-check-yes" v-if="item.checked" :class="{'radio':!multiple}" :style="{'border-color':confirmColor}">
								<view class="tki-tree-check-yes-b" :style="{'background-color':confirmColor}"></view>
							</view>
							<view class="tki-tree-check-no" v-else :class="{'radio':!multiple}" :style="{'border-color':confirmColor}"></view>
						</view>
					</view>
				</block>
				<block v-if="treeList.length === 0">
					<view class="loading">
						<text>{{tipText}}</text>
					</view>
				</block>
				<block v-if="(treeList.length === 20)">
					<view class="loading" style="margin-top: 30rpx; color: #999;">
						<text>默认展示20条数据，更多数据请搜索查询</text>
					</view>
				</block>
				<block>
					<view class="lifter" style="padding: 60rpx; margin: 60rpx;"></view>
				</block>
			</scroll-view>
		</view>
	</view>
</template>

<script>
import formTextInput from '@/components/form-text-input'
	
export default {
	name: "tki-tree",
	props: {
		inputType: {
			type: String,
			default: () => 'text'
		},
		range: {
			type: Array,
			default: function () {
				return []
			}
		},
		rangeKey: {
			type: String,
			default: 'label'
		},
		idKey: {
			type: String,
			default: 'id'
		},
		title: {
			type: String,
			default: ''
		},
		placeholder: {
			type: String,
			default: '请输入搜索内容'
		},
		multiple: { // 是否可以多选
			type: Boolean,
			default: false
			// default: true
		},
		selectParent: { //是否可以选父级
			type: Boolean,
			default: false
		},
		confirmColor: { // 确定按钮颜色
			type: String,
			default: '#2273F6' // #07bb07
		},
		cancelColor: { // 取消按钮颜色
			type: String,
			default: '#333333' // #757575
		},
		titleColor: { // 标题颜色
			type: String,
			default: '' // #757575
		},
		currentIcon: { // 展开时候的ic
			type: String,
			default: ''
		},
		defaultIcon: { // 折叠时候的ic
			type: String,
			default: ''
		},
		lastIcon: { // 没有子集的ic
			type: String,
			default: ''
		},
		border: { // 是否有分割线
			type: Boolean,
			default: false
		},
		intIsShow: { // 输入框是否显示
			type: Boolean,
			default: true
		},
		treeStatus: {   //加载状态  1·正在加载， 2·暂无数据
			type: Number,
			default: 1
		}
	},
	components: {
		formTextInput
	},
	data() {
		return {
			tipText: '正在加载...',
			showTree: false,
			treeList: [],
			flag: true,
			selectIndex: -1,
			searchVal: '',    //搜索输入框的内容
			testList: []
		}
	},
	
	computed: {
	},
	methods: {
		setTipText(val){
			this.tipText=val;
		},
		search(value) {
			this.$emit('watchSearch', value)
		},
		_show() {
			this.showTree = true
		},
		_hide() {
			this.showTree = false
			this.searchVal = ''
            this._reTreeList()
            this.$emit('hide', '')
		},
		_cancel() {
			this._hide()
			this.$emit("cancel", '');
		},
		_confirm() {
			// 处理所选数据
			let rt = [], obj = {};
			this.treeList.forEach((v, i) => {
				if (this.treeList[i].checked) {
					obj = {}
					obj.parents = this.treeList[i].parents
					obj = Object.assign(obj, this.treeList[i].source)
					// 移除子元素
					delete obj.children
					rt.push(obj)
				}
			})
			this._hide()
			this.$emit("confirm", rt);
		},
		//扁平化树结构
		_renderTreeList(list = [], rank = 0, parentId = [], parents = []) {
			list.forEach(item => {
				if (this.treeList.length > 200) return;
				
				this.treeList.push({
					id: item[this.idKey],
					name: item[this.rangeKey],
					source: item,
					parentId,  // 父级id数组
					parents,  // 父级id数组
					rank,  // 层级
					showChild: false,  //子级是否显示
					show: rank === 0,  // 自身是否显示
					checked: false,
				})
				if (Array.isArray(item.children) && item.children.length > 0) {
					let parentid = [...parentId], parentArr = [...parents];
					delete parentArr.children
					parentid.push(item[this.idKey]);
					parentArr.push({ 
						[this.idKey]: item[this.idKey], 
						[this.rangeKey]: item[this.rangeKey] 
					})
					this._renderTreeList(item.children, rank + 1, parentid, parentArr);
				} else {
					this.treeList[this.treeList.length - 1].lastRank = true;
				}
			})
		},
		// 点击
		_treeItemTap(item, index) {
			if (item.lastRank === true) {
				//点击最后一级时触发事件
				this.treeList[index].checked = !this.treeList[index].checked
				this._fixMultiple(index)
				return;
			}
			let list = this.treeList;
			let id = item.id;
			item.showChild = !item.showChild;
			list.forEach((childItem, i) => {
				if (item.showChild === false) {
					//隐藏所有子级
					if (!childItem.parentId.includes(id)) {
						return;
					}
					if (childItem.lastRank !== true) {
						childItem.showChild = false;
					}
					childItem.show = false;
				} else {
					if (childItem.parentId[childItem.parentId.length - 1] === id) {
						childItem.show = true;
					}
				}
			})
		},
		_treeItemSelect(item, index) {
			this.treeList[index].checked = !this.treeList[index].checked
			this._fixMultiple(index)
		},
		// 处理单选多选
		_fixMultiple(index) {
			if (!this.multiple) {
				// 如果是单选
				this.treeList.forEach((v, i) => {
					if (i != index) {
						this.treeList[i].checked = false
					}
				})
			}
		},
		// 重置数据
		_reTreeList() {
			this.treeList.forEach((v, i) => {
				this.treeList[i].checked = false
			})
		}
	},
	watch: {
		treeStatus:{
			handler:function(val){
				if(val == 1){
					this.tipText = '正在加载...'
				}else if(val == 2){
					this.tipText = '暂无数据...'
				}
			},
			deep: true,
			immediate:true
		},
		range(list) {
			const _this = this
			this.treeList = [];
			this._renderTreeList(list);
			if(list.length == 0){
				this.flag = true
				// setTimeout(function(){
				// 	_this.tipText = '暂无数据...'
				// }, 3500)
			}else{
				this.flag = false
			}
			
		},
		multiple() {
			if (this.range.length) {
				this._reTreeList();
			}
		},
		selectParent() {
			if (this.range.length) {
				this._reTreeList();
			}
		},
	},
	
}
</script>

<style>
@import "style.css";
</style>
